Daniel Carrera wrote:
> 
> What do people think of making "Math.sqrt(-1)" return "Complex(0,1)"?

It already does.

[kentda@v052a kentda]$ irb          
irb(main):001:0> Math.sqrt(-1)
ArgumentError: square root for negative number
        from (irb):1:in `sqrt'
        from (irb):1
irb(main):002:0> require 'complex'
true
irb(main):003:0> Math.sqrt(-1)
Complex(0, 1.0)
irb(main):004:0> 

This little trinket seemed to catch the attention when I tried it at a
small Ruby course last year.

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